Argon recycling system for naturally gasifying liquid argon in storage tank

Abstract

The utility model relates to the field of argon recovery, in particular to an argon recovery system for naturally gasifying liquid argon in a storage tank, which comprises a liquid argon storage tank, an argon output pipe, a liquid argon inlet pipe and a liquid argon outlet pipe are arranged on the liquid argon storage tank, and the tail ends of the argon output pipe and the liquid argon outlet pipe are both connected with a pipe network. The pipe network is connected with a user through a user pipeline, a first valve, an emptying pipeline, a first vaporizer, a compressor and an air pump are sequentially arranged on the argon output pipe in the argon conveying direction, a second valve is arranged on the emptying pipeline, and a liquid argon pump and a second vaporizer are sequentially arranged on the liquid argon discharge pipe in the liquid argon conveying direction. According to the utility model, part of argon which is naturally gasified and emptied can be collected and reused, so that the cost is saved.

Description

Technical Field

[0001] The utility model relates to the field of argon recovery, in particular to an argon recovery system for naturally gasifying liquid argon in a storage tank. Background Art

[0002] Argon is a rare gas widely used in industry. It is very inactive and can neither burn nor support combustion. Argon is a rare gas in the air. Argon can be stored and transported in liquid form at a temperature below -186°C. The liquid impact when liquid argon enters the storage tank and the large temperature difference between the liquid argon in the storage and the outside world cause part of the liquid argon to vaporize. In order to maintain the pressure of the storage tank and avoid overpressure, the vaporized part of the argon must be discharged, resulting in waste. Utility Model Content

[0003] The utility model aims to provide an argon recovery system for naturally vaporizing liquid argon in a storage tank, so as to solve the problem of liquid shock when liquid argon enters the storage tank and the influence of the large temperature difference between the liquid argon in the storage and the outside world mentioned in the background technology, so that part of the liquid argon is vaporized. In order to maintain the pressure of the storage tank and avoid overpressure, the vaporized part of the argon must be discharged, resulting in waste.

[0004] The utility model adopts the following technical solutions:

[0005] The utility model provides an argon recovery system for naturally gasifying liquid argon in a storage tank, comprising a liquid argon storage tank, on which an argon output pipe, a liquid argon inlet pipe and a liquid argon outlet pipe are arranged; the ends of the argon output pipe and the liquid argon outlet pipe are both connected to a pipe network, and the pipe network is connected to a user through a user pipeline;

[0006] The argon gas output pipe is provided with a first valve, a venting pipe, a first vaporizer, a compressor and an air pump in sequence along the argon gas delivery direction, and the venting pipe is provided with a second valve;

[0007] The liquid argon discharge pipe is provided with a liquid argon pump and a second vaporizer in sequence along the liquid argon conveying direction.

[0008] Further, the liquid argon storage tank includes a hollow heat-insulating inner shell, a first cavity is arranged between the inner and outer walls of the heat-insulating inner shell, a heat-insulating cover is arranged at the top of the heat-insulating inner shell, the heat-insulating cover and the heat-insulating inner shell surround a second cavity, the top of the heat-insulating inner shell is provided with the argon gas output pipe and the nitrogen gas output pipe, the argon gas output pipe is communicated with the second cavity, the nitrogen gas output pipe is communicated with the first cavity, a third valve is arranged on the nitrogen gas output pipe, the bottom end of the heat-insulating inner shell is provided with the liquid argon gas output pipe, the liquid argon gas output pipe is communicated with the second cavity, a cooling pipe is arranged in the heat-insulating inner shell, and the cooling pipe The invention comprises an inner tube and an outer tube, wherein the inner tube is arranged in the outer tube, the top ends of the inner tube and the outer tube are sealed and connected by a first sealing cover, the bottom end of the inner tube is provided with a second blocking cover, the side wall of the top end of the inner tube is provided with the liquid argon inlet pipe, the bottom end is connected with the second cavity through a connecting pipe, the liquid argon inlet pipe passes through the heat-insulating inner shell and is connected with a liquid argon supply device, the inner tube and the outer tube enclose a third cavity, the third cavity is connected with the first cavity, the top end of the outer tube is provided with a liquid nitrogen injection pipe, one end of the liquid nitrogen injection pipe is connected with the third cavity, and the other end passes through the heat-insulating inner shell and is connected with a liquid nitrogen supply device.

[0009] Furthermore, the liquid argon inlet pipe and the liquid nitrogen injection pipe are both vacuum insulated pipes.

[0010] Furthermore, a reflux pipe is connected in parallel to the argon gas output pipe, one end of the reflux pipe is connected between the vent pipe and the first vaporizer, and the other end is connected between the compressor and the pipe network, and a fourth valve is provided on the reflux pipe.

[0011] Furthermore, an outer insulation shell is provided on the outside of the insulation inner shell, pearl sand is filled between the insulation outer shell and the insulation inner shell, and the argon output pipe, the liquid argon inlet pipe, the liquid argon discharge pipe, the nitrogen discharge pipe and the liquid nitrogen injection pipe all pass through the insulation outer shell.

[0012] Compared with the prior art, the beneficial technical effects of the utility model are:

[0013] The utility model can collect part of the argon gas released by natural gasification and reuse it, thus saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The utility model will be further described below in conjunction with the accompanying drawings.

[0015] Figure 1 This is a diagram of a system for recovering argon gas naturally vaporized from liquid argon in a storage tank in an embodiment of the utility model;

[0016] Figure 2 It is a cross-sectional view of a liquid argon storage tank in an embodiment of the utility model;

[0017] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0018] Explanation of the reference numerals: 1. liquid argon storage tank; 101. insulation inner shell; 102. first cavity; 103. insulation cover; 104. second cavity; 105. insulation outer shell; 106. pearl sand; 2. argon output pipe; 3. liquid argon inlet pipe; 4. liquid argon discharge pipe; 5. pipe network; 6. user pipeline; 7. user; 8. first valve; 9. venting pipe; 10. first vaporizer; 11. compressor; 12. air pump; 13. second valve; 14. liquid argon pump; 15. second vaporizer; 16. nitrogen discharge pipe; 17. third valve; 18. cooling pipe; 1801. inner pipe; 1802. outer pipe; 1803. first sealing cover; 1804. second blocking cover; 1805. third cavity; 19. connecting pipe; 20. liquid nitrogen injection pipe; 21. reflux pipe; 22. fourth valve. DETAILED DESCRIPTION

[0019] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0020] like Figure 1 As shown, this embodiment discloses an argon recovery system for naturally gasifying liquid argon in a storage tank, comprising a liquid argon storage tank 1, on which an argon output pipe 2, a liquid argon inlet pipe 3 and a liquid argon discharge pipe 4 are provided; the ends of the argon output pipe 2 and the liquid argon discharge pipe 4 are both connected to a pipe network 5, and the pipe network 5 is connected to a user 7 through a user pipeline 6.

[0021] The argon output pipe 2 is provided with a first valve 8 which is a normally open valve, a venting pipe 9, a first vaporizer 10, a compressor 11 and an air pump 12 in sequence along the argon delivery direction. The venting pipe 9 is provided with a second valve 13 which is a venting valve.

[0022] A liquid argon pump 14 and a second vaporizer 15 are sequentially arranged on the liquid argon discharge pipe 4 along the liquid argon conveying direction, wherein the first vaporizer 10 is an air-temperature vaporizer, and the second vaporizer 15 is a steam vaporizer.

[0023] like Figure 2 , 3As shown, in this embodiment, the liquid argon storage tank 1 includes a hollow insulation inner shell 101, a first cavity 102 is arranged between the inner and outer walls of the insulation inner shell 101, an insulation cover 103 is arranged at the top of the insulation inner shell 101, the insulation cover 103 is filled with pearl sand, the insulation cover 103 and the insulation inner shell 101 surround a second cavity 104, an argon gas output pipe 2 and a nitrogen gas output pipe 16 are arranged at the top of the insulation inner shell 101, the argon gas output pipe 2 is communicated with the second cavity 104, the nitrogen gas output pipe 16 is communicated with the first cavity 102, a third valve 17 is arranged on the nitrogen gas output pipe 16, and the third valve 17 is a vent valve, a liquid argon gas output pipe 4 is arranged at the bottom of the insulation inner shell 101, the liquid argon gas output pipe 4 is communicated with the second cavity 104, a cooling pipe 18 is arranged in the insulation inner shell 101, and the cooling pipe 18 includes an inner pipe 1801 and an outer pipe 1802, and the inner The tube 1801 is arranged in the outer tube 1802, and the top ends of the inner tube 1801 and the outer tube 1802 are sealed and connected through the first sealing cover 1803. The bottom end of the inner tube 1801 is provided with a second blocking cover 1804. The side wall of the top end of the inner tube 1801 is provided with a liquid argon inlet tube 3, and the bottom end is connected with the second cavity 104 through the connecting tube 19. The liquid argon inlet tube 3 passes through the heat-insulating inner shell 101 and is connected with the liquid argon supply device. The inner tube 1801 and the outer tube 1802 enclose a third cavity 1805, and the third cavity 1804 is connected with the first cavity 102. A liquid nitrogen injection tube 20 is provided at the top end of the outer tube 1802, one end of the liquid nitrogen injection tube 20 is connected with the third cavity 1804, and the other end passes through the heat-insulating inner shell 101 and is connected with the liquid nitrogen supply device. Liquid nitrogen is injected into the third cavity 1804 through the liquid nitrogen injection tube 20 to prevent the liquid argon in the inner tube 1801 from vaporizing.

[0024] In this embodiment, both the liquid argon inlet pipe 3 and the liquid nitrogen injection pipe 20 are vacuum insulated pipes to prevent the liquid argon or liquid nitrogen from vaporizing.

[0025] In this embodiment, a reflux pipe 21 is connected in parallel to the argon gas output pipe 2, one end of the reflux pipe 21 is connected between the vent pipe 9 and the first vaporizer 10, and the other end is connected between the compressor 11 and the pipeline 5. A fourth valve 22 is provided on the reflux pipe 21. The fourth valve 22 is a reflux valve to ensure that the pressure before the air pump 12 is controlled at 5-20Kpa. If the intake pressure is lower than 5Kpa, the fourth valve 22 automatically opens to ensure that the pressure is stable between 5-20Kpa.

[0026] In this embodiment, an insulating outer shell 105 is provided on the outside of the insulating inner shell 101, and pearl sand 106 is filled between the insulating outer shell 105 and the insulating inner shell 101. The argon output pipe 2, the liquid argon inlet pipe 3, the liquid argon discharge pipe 4, the nitrogen discharge pipe 16 and the liquid nitrogen injection pipe 20 all pass through the insulating outer shell 105.

[0027] The use process of the utility model is as follows:

[0028] First, liquid nitrogen is injected into the third cavity 1805 from the liquid nitrogen injection pipe 20, and the liquid nitrogen reaches the first cavity 102 after passing through the third cavity 1805. After the first cavity 102 is filled with liquid nitrogen, liquid argon is injected into the inner tube 1801 from the liquid argon inlet pipe 3, and the liquid argon enters the second cavity 104 through the connecting pipe 19. After a certain amount of liquid argon is injected, the first valve 8 on the argon output pipe 2 is opened to release the pressure to ensure the safe operation of the storage tank. The vaporized liquid argon in the second cavity 104 is reheated to room temperature by the first vaporizer 10, and then pressurized to about 1.6 MPa by the compressor 11, and then merged into the pipe network 9 by the air pump 12, and then supplied to the user 7 for use. The remaining argon after use by the user 7 is discharged from the venting pipe 9. In this process, the vaporized liquid nitrogen is discharged from the nitrogen discharge pipe 16;

[0029] When the vaporized liquid argon in the second cavity 104 is insufficient for the user 7 to use, the liquid argon is discharged from the liquid argon discharge pipe 4 , and is reheated by the liquid argon pump 14 and the second vaporizer 15 and supplied to the user 7 for use.

[0030] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A system for recovering argon gas from liquid argon in a storage tank, characterized by: The invention comprises a liquid argon storage tank (1), on which an argon gas output pipe (2), a liquid argon inlet pipe (3) and a liquid argon discharge pipe (4) are arranged; the ends of the argon gas output pipe (2) and the liquid argon discharge pipe (4) are both connected to a pipe network (5), and the pipe network (5) is connected to a user (7) through a user pipeline (6); The argon gas output pipe (2) is provided with a first valve (8), a venting pipe (9), a first vaporizer (10), a compressor (11) and an air pump (12) in sequence along the argon gas conveying direction, and the venting pipe (9) is provided with a second valve (13); A liquid argon pump (14) and a second vaporizer (15) are sequentially arranged on the liquid argon discharge pipe (4) along the liquid argon conveying direction.

2. The argon recovery system for naturally gasifying liquid argon in a storage tank according to claim 1, characterized in that: The liquid argon storage tank (1) comprises a hollow heat-insulating inner shell (101), a first cavity (102) is arranged between the inner and outer walls of the heat-insulating inner shell (101), a heat-insulating cover (103) is arranged at the top end of the heat-insulating inner shell (101), the heat-insulating cover (103) and the heat-insulating inner shell (101) surround a second cavity (104), the argon gas output pipe (2) and the nitrogen gas output pipe (16) are arranged at the top end of the heat-insulating inner shell (101), the argon gas output pipe (2) and the nitrogen gas output pipe (16) are arranged at the top end of the heat-insulating inner shell (101), and the argon gas output pipe (102) is provided with a heat-insulating cover (103) and a heat-insulating cover (103) and a heat-insulating cover (103) and a heat-insulating cover (103) and a heat-insulating cover (103) and a heat-insulating cover (103) and a heat-insulating cover (101) are provided with a heat-insulating cover (103) and a heat-insulating cover (103) and a heat-insulating cover (104) and ...3) and a heat-insulating cover (103) and a heat-insulating cover (103) 2) is communicated with the second cavity (104), the nitrogen discharge pipe (16) is communicated with the first cavity (102), a third valve (17) is arranged on the nitrogen discharge pipe (16), the bottom end of the heat-insulating inner shell (101) is provided with the liquid argon discharge pipe (4), the liquid argon discharge pipe (4) is communicated with the second cavity (104), a cooling pipe (18) is arranged in the heat-insulating inner shell (101), and the cooling pipe (18) comprises an inner tube (1801 ) and an outer tube (1802), the inner tube (1801) is arranged inside the outer tube (1802), the top ends of the inner tube (1801) and the outer tube (1802) are sealed and connected via a first sealing cover (1803), the bottom end of the inner tube (1801) is provided with a second blocking cover (1804), the top end of the inner tube (1801) is provided with the liquid argon inlet tube (3), the bottom end of the inner tube (1801) is connected with the second cavity (104) via a connecting tube (19), The liquid argon inlet pipe (3) passes through the heat-insulating inner shell (101) and is connected to the liquid argon supply device; the inner tube (1801) and the outer tube (1802) enclose a third cavity (1805); the third cavity is connected to the first cavity (102); a liquid nitrogen injection pipe (20) is provided at the top end of the outer tube (1802); one end of the liquid nitrogen injection pipe (20) is connected to the third cavity, and the other end passes through the heat-insulating inner shell (101) and is connected to the liquid nitrogen supply device.

3. The argon recovery system for naturally gasifying liquid argon in a storage tank according to claim 2, characterized in that: The liquid argon inlet pipe (3) and the liquid nitrogen injection pipe (20) are both vacuum insulated pipes.

4. The argon recovery system for naturally gasifying liquid argon in a storage tank according to claim 2, characterized in that: A return pipe (21) is connected in parallel to the argon gas output pipe (2); one end of the return pipe (21) is connected between the vent pipe (9) and the first vaporizer (10), and the other end is connected between the compressor (11) and the pipe network (5); a fourth valve (22) is provided on the return pipe (21).

5. The argon recovery system for naturally gasifying liquid argon in a storage tank according to claim 2, characterized in that: The outer side of the heat-insulating inner shell (101) is provided with a heat-insulating outer shell (105), the space between the heat-insulating outer shell (105) and the heat-insulating inner shell (101) is filled with pearl sand (106), and the argon gas output pipe (2), the liquid argon inlet pipe (3), the liquid argon discharge pipe (4), the nitrogen gas discharge pipe (16) and the liquid nitrogen injection pipe (20) all pass through the heat-insulating outer shell (105).

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